SiBE811001EB
Troubleshooting
CONVENI-PACK
196
8.4.21 Inverter Compressor Motor Lock
Error Code
E5
Applicable
Models
LRYEQ16AY1
Method of Error
Detection
Inverter PCB takes the position signal from UVW line connected between the inverter and
compressor, and the error is detected when any abnormality is observed in the phase-current
waveform.
Error Decision
Conditions
This error will be output when the inverter compressor motor does not start up even in forced
startup mode.
Supposed
Causes
Inverter compressor lock
High differential pressure (0.5MPa or more)
Incorrect UVW wiring
Defective inverter PCB
Stop valve is not opened
Refrigerant is melting
Wear of sliding parts caused by humid operation due to malfunctioning secondary-side unit
electronic expansion valve.
Oil not returned due to defective local piping setting
Liquid pack due to defective operation signal connection
Troubleshooting
Check if the stop
valve is open.
Check if the relay wires
to the compressor are
correct.
Check if the connection
of UVW phase order is
correct.
Check if the wiring
is the same as in
the wiring diagram.
The insulation
resistance of the
compressor is low
(not more than
100k
Ω
).
The compressor coil
has disconnection of
wires.
U
W
V
Check if the wiring has any error in
mistake for inverter compressor.
Power OFF
Onsite causes.
Open the stop valve.
NO
Replace the relay wires and
ensure right connection of the
connector.
NO
Ensure correct connection.
NO
Ensure correct connection.
NO
Replace the compressor.
YES
YES
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
YES
YES
YES
YES
NO
NO
A